Window sash fastener



C. V.. BUMB Jan. 14-, 1936.

WINDOW SASH FASTENER Filed Nov. 2, 1934 INVENTOR. 67mm ES 1 jun l5.

ATTORNEYi z I I I I 1 r 1/ Patented Jan. 14, 1936 UNITED STATES tons PATENT OFFICE 2 Claims.

This invention relates to a window sash fastener or look which functions when in operative position to prevent forcible opening of a window sash, either when closed or in partially open position.

Fasteners of a similar character have heretofore been devised to function substantially in the same manner, but of a character which either mars the surface of the sash when a normal effort to open it' is exerted, or permits the sash to be opened under a forceful exertion. Thus, such devices have either been provided with a toothed or biting-in surface which would mar the surface of the sash in its normal action, or a smooth or soft surface to prevent marring butwhich will slide on the surface under forceful exertion being applied to the sash. Such locks also are so arranged that if it is desired to open the window from the outside, a thin knife blade or wire may be inserted between the sashes in such manner as to readily lift the look from engagement, thereby permitting of the free opening of the window.

It is the object of this invention to devise a lock of this character as an improvement over those above mentioned, which embodies two looking elements, such as a rubber roller for normally and friotionally gripping the window sash, to prevent an opening movement thereof under normal conditions. Associated with the roller there is'a toothed member which will biteinto the surface of a wooden sash and positively lock it against opening movement when undue pressure is exerted. Also associated with the lock and acting as a support therefor, there is provided a guard so arranged as to prevent tampering with the look from the outside by means of a knife blade or wire inserted between the upper and lower sashes.

The full nature of the invention will be understood from the accompanying drawing and the following description and claims:

Fig. l is a vertical section through .a portion of the upper and lower sashes and window showing the lock mounted thereon in normally operative position. Fig. 2 is the same as Fig. 1 showing a side elevation of the sashes with a rear elevation of the lock. Fig. 3 is the same as Fig. 1, showing 50 a horizontal section through the upper sash with a plan view of the lock and lower sash, as taken on the line 3-3 of Fig. 1. Fig. 4 is a fragmentary perspective view illustrating the relative position of the lock and upper sash with parts removed 55 and in section when the lock is moved to gripping position upon excessive force being exerted to open the sash.

In the drawing there is illustrated a lower window sash l0 and an upper window sash l I having the usual vertical frame members I?! and I3, re- 5 spectively.

The look, as hereinafter described, is secured by screws or the like to the upper surface of the lower sash l8 and to one side thereof, whereby it may engage against the inner surface of the 10 upright it of the upper sash II.

The lock consists of a metal support and guard having a base It with upright side walls I5. Pivotally mounted on the far end of the side walls l5 of the support there is a pair of arms l6 15 mounted on a pivotal pin ll. Said arms embrace a cushion member is formed of a yielding substance, such as rubber, adapted to give slightly but not sufficient to collapse. Said member is pivotally mounted between the free ends of the 0 arms It on the end of which there is a locking tooth E9. The cushion member 58 has a portion of its peripheral surface substantially concentric with its pivotal mounting, so that when the arms lie in the positions illustrated, the concentric 5 surface of the cushion will rest against the surface of the upright !3 on the upper sash II, the arms extending upwardly at an angle so that the weight thereof will maintain the cushion member in engaging position. The upper portion of the 3 cushion is formed with a handle 28 which permits of the manual manipulation of the device.

In operation, to raise the lower sash or lower the upper sash, the handle 26 is gripped and the cushion member swung around the pivotal 35 mounting ll out of engagement with the upright 13. If free movement of the windows is desired, it can be thrown clear over in reverse position until the ear 21 engages the base plate Hi. In this position, it would be inoperative. When the 40 sashes are adjusted to the desired open position, or if in closed position, the cushion member I8 is moved into operating position, as illustrated. In such position, further opening of the sash will be restrained by the friction resulting from engagement of the cushion member [8 with the surface of the upright, such friction increasing by the wedging action resulting from the angularly extended position and pivotal mounting of the arms Hi.

In normal functioning, the rubber cushion member lies in engagement with the upper sash so as to have no marring effect upon the surface of the wood. However, if excessive force is employed, the rubber cushion will be compressed until the locking teeth 19 engage the surface of the sash. Still greater force will cause the teeth I 9 to bite into the wood, resulting in a positive locking action. Thus, for ordinary purposes, the lock restrains the opening movement of the sashes by the cushion member I 8, while an excessive effort to move the sashes to open position results in bringing the locking teeth I9 into action, which positively locks them.

By reason of the guard, comprising the supporting base M and side walls IS, the locking device, comprising the arms l6 and cushion I8, is protected against manipulation from outside through the medium of a knife blade, rod, wire or the like, inserted upwardly between the sashes.

While the device has been shown and described herein as mounted to engage one of the sashes, it is possible to so mount it on one of the sashes as to cause its engagement with the inner surface of the sash frame.

The invention claimed is:

1. A window sash lock comprising a support adapted to be secured on a window sash, a pair of walls extending upwardly therefrom, a pair of arms pivotally mounted on said support extending upwardly at an angle thereto between said walls, a yielding cushion member mounted between the free ends of said arms for frictional engagement with a locking surface, and tooth projections formed on the free ends of said arms and extending short of the point of normal engaging of the cushion and said locking surface, whereby said projections will be caused to bite into said surface for positively preventing the relative movement of said surface and sash in one direction upon sufficient force being exerted to compress the cushion member.

2. A window sash lock comprising a support adapted to be secured to a window sash, said support extending beyond the edge of the sash to which it is secured, a pair of walls formed 10 integrally upon said support, an arm pivotally connected to each of said walls adjacent the inner surface thereof, a yielding cushion member mounted between the ends of said arms for frictional engagement with a locking surface, said member being provided with a projection for the manual manipulation thereof, a toothed projection formed on the free ends of each of said arms and extending short of the point of normal engagement of said member and said locking surface whereby said projections will be caused to bite into said surface for positively preventing the relative movement of said surface and sash in one direction upon sufficient force being exerted to compress the cushion member, and a projection extending from the pivoted end of each of said arms adapted to engage said support for limiting the inoperative position of said arms and member.

CHARLES V. BUMB. 3O 

